1. You may try to tune PCI configuration registers referred in that post.
2. Or (just an idea) you may try to power down unsupported devices with
setting hw.pci.do_power_nodriver=3 into the device.hints.
3. Or (it works fine for my ENE CB714 chip) you may try to add
0x08431180 chip ID into the list of supported SD controllers like it is
done for 0x08221180. They may be compatible enough.